好きな漢字：
少 It looks like a happy face!
旦 It is what it looks like: morning. Also, I can't get over the fact that one of the readings sounds like "dawn". 歌, 栗, 奈, 苗, 英 I just think they're especially pleasing to the eye.

きらいな漢字：
臼 It looks like a broken 日.
曰 Looks too much like 日.
無 Why so many strokes for a kanji that means "none"?
骨 I just hate how that square is off to the side.
姦 Woman + woman + woman = RAPE!